Which isotope of nitrogen is more commonly found nitrogen-14 or nitrogen-15?
Nitrogen 14 is by far the most abundant isotope (99.63%
An easy way to figure out which one is the most abundant is to
look at the periodic table. The mass on the periodic table is the
weighted average of all possible isotopes. The atomic mass of
nitrogen is 14.00674. You can gather from this that the most
abundant isotope is N-14, since the number is VERY close to 14.
It is also possible to guess the most common isotope if you do
not have access to a periodic table. Nitrogen has 7 protons and the
most stable isotope is Nitrogen 14, which has 7 neutrons in
addition to the protons. In virtually all elements, the stable
isotopes are those that have the same or very similar number of
neutrons as the number of protons in the nucleus. This works for
Carbon which has 6 protons and 6 neutrons in the nucleus for Carbon
12, the most common isotope.
This is also true for Oxygen 16 (8P and 8N), Silicon 28 (14P and
14N), and just about any element you choose.
An isotope of nitrogen containing seven neutrons would be nitrogen